Titanium Layered Electrode Sheets for Strength and Current Flow
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Solution Overview
Problem
Current PEM electrolyzer and fuel cell components, such as bipolar plates and porous transport layers, face challenges in maintaining mechanical strength, efficient current flow, and reactant/product transport under high pressure conditions, with poorly defined contact points in expanded metal sheets leading to unreliable electrical conductivity.
Innovation Solution
A method for producing layered sheet structures from titanium or titanium alloys using powder metallurgy, involving a supporting layer with defined openings and a porous transport layer, where the first metal sheet layer forms a stiff supporting structure and the second layer provides capillary transport, with debinding and sintering to achieve strong bonding and improved electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If expanded metal sheets are used as supporting layers, then mechanical strength is provided, but electrical conductivity becomes unreliable due to poorly defined contact points
Solution Approach 1:
The supporting layer is divided into discrete contact points arranged in a pattern, rather than using continuous expanded metal sheets. This segmentation allows for well-defined electrical contact points while maintaining mechanical strength through the distributed contact point structure.
Solution Approach 2:
The supporting layer has different properties at different locations: discrete contact points provide localized electrical conductivity, while the spaces between contact points provide mechanical support. This local differentiation resolves the contradiction between mechanical strength and reliable electrical conductivity.
2Productivity
If porous transport layers with small pores are used, then capillary transport of water is improved, but mechanical strength decreases
Solution Approach 1:
The porous transport layer is positioned between the supporting layer and the membrane, creating a multi-layer structure. This dimensional arrangement allows the porous layer to optimize capillary transport in its own plane while the supporting layer provides mechanical strength from beneath, resolving the strength-transport contradiction.
Solution Approach 2:
The system uses a composite structure combining the porous transport layer with the supporting layer. The porous layer provides capillary transport functionality while the supporting layer provides mechanical strength, creating a composite system that achieves both requirements simultaneously.
3Productivity
If membrane thickness is reduced to save costs and increase efficiency, then device cost and effectiveness improve, but mechanical stability and protection against damage decrease
Solution Approach 1:
The supporting layer with its discrete contact points and the porous transport layer are positioned between external forces and the thin membrane, providing beforehand cushioning and protection. This allows the membrane to be made thin for efficiency while the supporting structures prevent mechanical damage during operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in enhanced mechanical and electrical bonding, improved current flow, and efficient reactant/product transport, optimizing the performance and efficiency of PEM electrolyzers and fuel cells by creating a structured framework that supports high-pressure operations.
Implementation Method 1
The proton exchange membrane is sandwiched between two porous transport layers (PTL), in order to transport the reactant, e.g. water, onto the catalyzers and onto the PEM and to transport the reaction products away again. Such transport is basically achieved by capillary function of the material featuring open pores of small dimensions.
Implementation Method 2
d) debinding the green part or green parts and sintering the stack to densify the green part or green parts contained therein and to simultaneously bond the metal sheet layers of the stack.
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A method for producing layered sheet structures from titanium or titanium alloy metal for use in or as electrodes of PEM-type electrolyzers and/or fuel cells comprising the following steps: a) providing a first sheet-like green part that is formed from a powder of titanium metal, titanium alloy metal and/or titanium hydride and from at least one binder material by selectively positioning material and leaving voids or open spaces therebetween, said first sheet-like green part being a green part of a first metal sheet layer, or providing a first metal sheet layer comprising a metallic frame structure including voids or open spaces, b) providing a second sheet-like green part that is formed from a powder of titanium metal, titanium alloy metal and/or titanium hydride and from at least one binder material, said second sheet-like green part being a green part of a second, porous metal sheet layer, or providing a second metal sheet layer in the form of a porous metal sheet layer, c) forming a stack comprising i. the first sheet-like green part and the second sheet-like green part or ii. the first sheet-like green part and the second metal sheet or iii. the first metal sheet and the second sheet-like green part, d) debinding the green part or green parts and sintering the stack to densify the green part or green parts contained therein and to simultaneously bond the metal sheet layers of the stack.